The relationship between two sets, A and B, is a tetralemma if there are four possibilities. There are phenomena that are members of (1) both set A and set B, (2) neither set A nor set B, (3) only set A, but not set B, or (4) only set B, but not set A.

Tibetan: མུ་བཞི། mu-bzhi

J. Hopkins: Four possibilities

Other languages

Deutsch: Tetralemma
Русский: Тетралемма